<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <style>
            *{
                margin: 0px;
                padding: 0px;
                list-style: none;
            }
            textarea{
                width: 800px;
                margin: 10px auto;
                display: block;
                resize: none;
                outline: none;
            }
            button{
                width: 800px;
                margin: 10px auto;
                display: block;
                background: orange;
                border: none;
                outline: none;
                line-height: 40px;
                cursor: pointer;
                color: #fff;
            }
            ul{
                width: 800px;
                margin: 10px auto;
            }
            ul>li{
                background-color:olivedrab;
                margin-bottom: 10px;
                position: relative;
                padding: 4px;
            }
            span{
                position: absolute;
                right: -5px;
                top: -5px;
                cursor: pointer;
            }
        </style>
    </head>
    <body>
        <textarea name="" id="txt" cols="30" rows="10"></textarea>
        <button id="btn">微博发布</button>
        <ul id="box">
            <li>
                微博
                <span onclick="del(this)">X</span>
            </li>
        </ul>


        <script>
            btn.onclick=function(){
                if(txt.value==''){
                    alert('请输入内容！')
                }else{
                    var d=new Date();
                    console.log(d)
                    var year=d.getFullYear();
                    var month=d.getMonth()+1
                    var date=d.getDate()
                    var val=txt.value;
                    var tag=document.createElement('li');
                    tag.innerHTML=`${val}
                    <p>${year}-${month}-${date}</p>
                    <span>X</span>`
                    box.appendChild(tag);
                    txt.value=''
                    }
            }

        </script>
    </body>
    </html>